【病句诊断】

They were praised for their good conducts.

他们因品德优良而受到赞扬。

【诊断辨析】

Conduct作为品德，品行，行为，举止时，为不可数名词，不能加s。

【诊断结果】

They were praised for their good conduct.

【举一反三】

We should be responsible for our conduct.

我们每个人都得为自己的行为负责。